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  {
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   "source": [
    "## 上周回顾\n",
    "\n",
    "> * 1. list的一般方法/函数的使用及案例，如\n",
    ">> 1. append（）增加，增加list元素到list的末尾，常用于新建列表\n",
    ">> 2. pop(index)/remove(values)对比两者优势\n",
    ">> 3. count() 查看某个元素出现的次数\n",
    ">> 4. index() 查看某个有还俗第一次出现的位置\n",
    ">> 5. extend() 两个list合并在一起，也可以用[]+[]来实现\n",
    ">> 6. sort() list元素的排序\n",
    "\n",
    "> * 2. list的高级用法：如\n",
    ">> 1. copy()list（可变的数据类型）复制 不等价于 赋值，可以用[:]来实现\n",
    ">> 2. enumerate() 枚举，可同时遍历并获取index和values"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "4f25745e",
   "metadata": {},
   "source": [
    "## 本周内容\n",
    "### list练习，vowels.py vowels2.py\n",
    "### list实践：\n",
    "### 初始字典"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "5956fdb6",
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "i\n",
      "i\n",
      "a\n"
     ]
    }
   ],
   "source": [
    "vowels = ['a','e','i','o','u']\n",
    "word = \"Miliways\"\n",
    "# 检查 word中出现的 元音，并打印出来 怎么做\n",
    "\n",
    "# 第一个元素letter 请不要和已有变量重名\n",
    "# 第一个元素一般不定义名字，常用item（元素）来命名  简写 i 来命名\n",
    "# 第二个元素word（重要），意味着将遍历的内容\n",
    "# 遍历的内容一般是 序列数据 str list（遍历元素，不一定是字符）\n",
    "\n",
    "for letter in word:\n",
    "    # print(letter)\n",
    "#     if letter in vowels:\n",
    "#         print(letter)\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "4c27661a",
   "metadata": {},
   "source": [
    "> * vowels2.py"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "66e14694",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['i', 'i', 'a']"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 使用append()新建列表\n",
    "found = []\n",
    "for letter in word:\n",
    "#     print(letter)\n",
    "    if letter in vowels: # letter在元音字母表中\n",
    "        if letter not in found:  # letter不在found表中\n",
    "        found.append(letter)\n",
    "found"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6e2d5adf",
   "metadata": {},
   "source": [
    "##  练习：购物车程序\n",
    "* 1.运行代码后，让用户输入支付宝余额，然后打印我们的商品列表给用户\n",
    "* 2.让用户输入商品编号进行商品的购买\n",
    "* 3.用户选择商品后，检查用户的余额是否够，若够则直接扣款，不够则提醒用户\n",
    "* 4.用户可以随时退出购买，退出时打印用户已购买的商品和支付余额\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "02181aae",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "invalid syntax (<ipython-input-3-4a7526eeebfc>, line 27)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-3-4a7526eeebfc>\"\u001b[1;36m, line \u001b[1;32m27\u001b[0m\n\u001b[1;33m    print i in range(len(goods_list)):\u001b[0m\n\u001b[1;37m          ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
    }
   ],
   "source": [
    "# 商品信息的数据存放（商品名称，商品价格，商品的编号）\n",
    "goods_list = [\n",
    "    [\"python课本\",80],\n",
    "    [\"iphone8\",6000],\n",
    "    [\"coffee\",30],\n",
    "    [\"mac book\",8000]\n",
    "]\n",
    "# 用户购物信息的数据存放\n",
    "user_shopping_list = []\n",
    "# 用户输入余额信息\n",
    "Alipay = int(input(\"请输入支付宝余额：\"))\n",
    "# 打印商品信息\n",
    "# info ='''------goods list------\n",
    "# 商品编号：%s,商品名称：%s，商品价格：%s\n",
    "# 商品编号：%s,商品名称：%s，商品价格：%s\n",
    "# 商品编号：%s,商品名称：%s，商品价格：%s\n",
    "# 商品编号：%s,商品名称：%s，商品价格：%s\n",
    "# '''%(0,goods_list[0][0],goods_list[0][1],\n",
    "#      1,goods_list[1][0],goods_list[1][1], \n",
    "#      2,goods_list[2][0],goods_list[2][1],\n",
    "#      3,goods_list[3][0],goods_list[3][1],\n",
    "#     )\n",
    "# print(info)\n",
    "\n",
    "# list的长度  len()\n",
    "print('-------goods list------')\n",
    "print i in range(len(goods_list)):\n",
    "    print(\"商品编号：%s，商品名称：%s，商品价格：%s 元\"%（i,goods_list[i][0],goods_list[i][1])\n",
    "    \n",
    "# 用户输入商品编号，实现商品的查询\n",
    "choice = int(input(\"请输入商品的编号：\")) # input输入的内容默认是字符串str 例如输入2，则显示\"2\"\n",
    "# 判断编号是否存在\n",
    "if choice < len(goods_list):\n",
    "   # 检查用户余额 > 商品价格\n",
    "   if Alipay > goods_list[choice][1]:\n",
    "        Alipay = Alipay - goods_list[choice][1] #用户余额发生变化，要扣除\n",
    "       user_shopping_list.append(goods_list[choice])\n",
    "    else:\n",
    "        print(\"您的余额已不足，请更换支付方式\")\n",
    "else:\n",
    "    print(\"请输入正确的商品编号，您输入的商品不存在\")\n",
    "    \n",
    "# 打印用户余额和用户的商品列表信息\n",
    "print(\"用户余额:&s,购物车：%s\"%(Alipay,user_shopping_list))\n",
    "    \n"
   ]
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